@RequestMapping("/token")
public Map<String,String> token (HttpSession session, HttpServletRequest request){
    System.out.println(request.getRemoteHost());

    String remoteHost= request.getRemoteHost();
    int portNumber = request.getRemotePort();

    System.out.println(remoteHost+":"+portNumber);
    System.out.println(request.getRemoteAddr());

    return Collections.singletonMap("token",session.getId());
}

@Injectable()
export class LoginService {

  constructor(private http: Http) { }

  sendCredential(username: string, password: string) {
    let url = "http://localhost:8181/token";
    let encodedCredentials = btoa(username+":"+password);
    let basicHeader = "Basic "+encodedCredentials;
    let headers = new Headers ({
        'Content-Type' : 'application/x-www-form-urlencoded',
        'Authorization' : basicHeader
    });

    return this.http.get(url, {headers: headers});

 }